Anatomy of the Eye Flashcards
What is the main blood supply to the orbit?
Opthalmic artery from the internal carotid
What nerve is general sensory from the eye?
Trigeminal, opthalmic division
Name the motor nerves to muscles of the eye?
Oculomotor, Abducens, Trochlear
What are the weakest parts of the orbital cavity?
Medial wall and floor
Name 2 symptoms of an orbital blow out fracture
Double vision, periorbital swelling, numbness over cheek and lower eyelid
Name the 2 glands in the eyelid
Meibomian glands and sebaceous glands
Define Blephartis
Inflammation of the eyelids
What is the orbital septum?
Sheet of fibrous tissue originating from the orbital rim periosteum and blends with tarsal plates
What makes up the lacrimal apparatus
lacrimal gland, lacrimal sac and ducts
Define epiphora
Overflow of tears over lower eyelid
Name the 3 layers of the eyeball
Outer = Sclera Middle = Choroid, cilliary body and iris Inner = retina
Name the 3 eye accommodations for near objects
Pupil constricts, eyes converge and lens becomes more biconvex (Fatter)
Do rods or cones deal with high definition colour vision?
Cones
Which cells pass the action potential to form the optic nerve?
Retinal ganglion cells
Where is aqueous humour secreted from?
Ciliary body
Define Glaucoma
Optic nerve damage secondary to raised intraocular pressure
What is the most common type of glaucoma?
Chronic, open-angle glaucoma . Trabecular meshwork deteriorates with age, so the drainage is slowed
Name 3 signs & symptoms of Acute closed-angle glaucoma
Painful red eye, 55 years +, irregular oval-shaped pupil, blurring of vision, halos around lights, nausea and vomiting.
